/// <summary>
/// Override this method to process your async operation. Required for
/// anything to happen when the message is processed. If the operation
/// succeeds (no exception), OnExecuteComplete will
/// be called. This method should throw an exception if the operation fails,
/// so that OnExecuteFailed will be fired.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
protected virtual void OnExecuteStart(QueueMessageManager manager)
{
if (ExecuteStart != null)
{
ExecuteStart(manager);
}
}
/// <summary>
/// Override this method to do any post processing that needs to happen
/// after each async operation has successfully completed. Optional - use
/// for things like logging or reporting on status.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
protected virtual void OnExecuteComplete(QueueMessageManager Message)
{
if (ExecuteComplete != null)
{
ExecuteComplete(Message);
}
}
/// <summary>
/// Override this method to handle any errors that occured during processing
/// of the async task. Optional - implement for logging or notifications.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
/// <param name="ex">
/// Exeception that caused the operation to fail
/// </param>
protected virtual void OnExecuteFailed(QueueMessageManager manager, Exception ex)
{
if (ExecuteFailed != null)
{
ExecuteFailed(manager, ex);
}
}
/// <summary>
/// Override this method to handle any errors that occured trying to receive
/// the next message from the SQL table.
///
/// Allows for error handling or logging in your own applications.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
/// <param name="ex">
/// Exeception that caused the operation to fail
/// </param>
protected virtual void OnNextMessageFailed(QueueMessageManager manager, Exception ex)
{
if (NextMessageFailed != null)
{
NextMessageFailed(manager, ex);
}
}
// global instances that keep controller and windows service alive
public void Start(QueueMessageManager manager = null)
{
if (manager == null)
manager = new QueueMessageManagerSql();
LogManager.Current.LogInfo("Start called");
var config = QueueMessageManagerConfiguration.Current;
Controller = new QueueController()
{
ConnectionString = config.ConnectionString,
QueueName = config.QueueName,
WaitInterval = config.WaitInterval,
ThreadCount = config.ControllerThreads
};
LogManager.Current.LogInfo("Controller created.");
// asynchronously start the SignalR hub
SignalR = WebApplication.Start<SignalRStartup>("http://*:8080/");
// *** Spin up n Number of threads to process requests
Controller.StartProcessingAsync();
LogManager.Current.LogInfo(String.Format("QueueManager Controller Started with {0} threads.",
Controller.ThreadCount));
// Set static instances so that these 'services' stick around
GlobalService.Controller = Controller;
GlobalService.Service = this;
}
protected void OnError(QueueMessageManager manager, string message = null)
{
if (message == null)
message = manager.ErrorMessage;
// clear out the message
// don't do this
manager.CancelRequest(messageText: "Failed: " + message,autoSave: true);
LogManager.Current.LogError(message);
// send email
//AppUtils.SendAdminEmail("MPWFQMM Failure", errorMessage);
}
protected override void ExecuteSteps(QueueMessageManager manager)
{
// show a started message
Stopwatch watch = new Stopwatch();
watch.Start();
// store on a thread
LocalDataStoreSlot threadData = Thread.GetNamedDataSlot(STR_STARTTIME_KEY);
Thread.SetData(threadData, watch);
QueueMonitorServiceHub.WriteMessage(manager.Item);
base.ExecuteSteps(manager);
}
/// <summary>
/// Implement OnExecuteStart to run queued actions/operations.
/// Call manager.CompleteRequest() or manager.CancelRequest() to
/// complete queue items.
///
/// Below is a commented simple example
/// </summary>
/// <param name="manager"></param>
//protected override void OnExecuteStart(QueueMessageManager manager)
//{
// base.OnExecuteStart(manager);
//
// string action = manager.Item.Action;
// try
// {
// switch (action)
// {
// case "HelloWorld":
// {
// Thread.Sleep(2000);
// manager.CompleteRequest(messageText: queueItem.Message + " - NEW completed at " + DateTime.Now,
// autoSave: true);
// break;
// }
// default:
// {
// manager.CancelRequest(messageText: "Failed: No matching action", autoSave: true);
// break;
// }
// }
// }
// catch (Exception ex)
// {
// manager.CancelRequest(messageText: "Failed: " + ex.Message, autoSave: true);
// }
//}
protected override void OnExecuteComplete(QueueMessageManager manager)
{
base.OnExecuteComplete(manager);
// Get Starting timestamp from TextInput
int elapsed = 0;
DateTime time = DateTime.UtcNow;
if (DateTime.TryParse(manager.Item.TextInput, out time))
elapsed = (int) DateTime.UtcNow.Subtract(time.ToUniversalTime()).TotalMilliseconds;
// also send down a waiting message count
int waitingMessages = GetWaitingMessageCount(manager);
WriteMessage(manager.Item, elapsed, waitingMessages);
}
protected override void OnExecuteFailed(QueueMessageManager manager, Exception ex)
{
base.OnExecuteFailed(manager, ex);
//timestamp from text input
int elapsed = 0;
DateTime time = DateTime.UtcNow;
if (DateTime.TryParse(manager.Item.TextInput, out time))
elapsed = (int) DateTime.UtcNow.Subtract(time.ToUniversalTime()).TotalMilliseconds;
var qm = manager.Item;
int waitingMessages = GetWaitingMessageCount(manager);
WriteMessage(qm, elapsed, waitingMessages);
}
/// <summary>
/// This is the 'handler' code that actually does processing work
/// It merely calls into any events that are hooked up to the controller
/// for these events:
///
/// ExecuteStart
/// ExecuteComplete
/// ExecuteFailed
/// </summary>
/// <param name="manager">Instance of QueueMessageManager and it's Item property</param>
protected virtual void ExecuteSteps(QueueMessageManager manager)
{
try
{
// Hook up start processing
OnExecuteStart(manager);
// Hookup end processing
OnExecuteComplete(manager);
}
catch (Exception ex)
{
OnExecuteFailed(manager, ex);
}
MessagesProcessed++;
}
protected void OnError(QueueMessageManager manager, string message = null, Exception ex = null)
{
if (message == null)
message = manager.ErrorMessage;
manager.CancelRequest(messageText: "Queue Error: " + message);
manager.Save();
string details = null;
if (ex != null)
details = ex.Source + "\r\n" + ex.StackTrace;
//LogManager.Current.LogError(message, details);
// send email
//AppUtils.SendAdminEmail("MPWFQMM Failure", errorMessage);
}
protected override void OnExecuteStart(QueueMessageManager manager)
{
base.OnExecuteStart(manager);
var queueItem = manager.Item;
try
{
string action = queueItem.Action;
if (!string.IsNullOrEmpty(action))
{
//Initialize Anything
action = action.Trim();
}
switch (action)
{
default:
// TODO: Remove for production
Thread.Sleep( (int) (DateTime.Now.Ticks % 500));
// use this instead to ensure that messages get updated properly and consistently
// that is: All flags are set, date is always UTC date, etc.
//if (!manager.CancelRequest(messageText: "Unknown Action", autoSave: true))
if (!manager.CompleteRequest(messageText: "Processing complete.", autoSave: true))
{
// this is pointless - if this save fails
// it's likely the save you are doing in
// onError will also fail
OnError(manager);
return;
}
//manager.CompleteCancelRequest(messageText: "Invalid message action provided.");
break;
}
}
catch (Exception ex)
{
OnError(manager,ex.GetBaseException().Message);
return;
}
}
int GetWaitingMessageCount(QueueMessageManager manager, int delay = 10)
{
return manager.GetWaitingQueueMessageCount(QueueName);
}
void Controller_ExecuteComplete(QueueMessageManager Message)
{
this.WriteEntry("Complete: " + Message.Item.Completed + "->" + Message.Item.Id + " - " + Message.Item.Message);
}
void Controller_ExecuteStart(QueueMessageManager Message)
{
this.WriteEntry("Started: " + Message.Item.Started + "->" + Message.Item.Id);
}
/// <summary>
/// Message hook that's responsible for retrieving the next message.
/// The base version pulls the next message for the given queue.
/// You can override this method to conditionally override this
/// behavior such as filter when and how messages are read.
/// </summary>
/// <param name="manager">A manager instance that can retrieve</param>
/// <param name="queueName">The queue to check</param>
/// <returns></returns>
protected virtual QueueMessageItem OnGetNextQueueMessage(QueueMessageManager manager, string queueName)
{
return(manager.GetNextQueueMessage(queueName));
}
/// <summary>
/// Override this method to handle any errors that occured during processing
/// of the async task. Optional - implement for logging or notifications.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
/// <param name="ex">
/// Exeception that caused the operation to fail
/// </param>
protected virtual void OnExecuteFailed(QueueMessageManager manager, Exception ex)
{
if (ExecuteFailed != null)
ExecuteFailed(manager, ex);
}
/// <summary>
/// This is where your processing happens
/// </summary>
/// <param name="manager"></param>
private void controller_ExecuteStart(QueueMessageManager manager)
{
// get active queue item
var item = manager.Item;
// Typically perform tasks based on some Action/request
if (item.Action == "PRINTIMAGE")
{
// recommend you offload processing
//PrintImage(manager);
}
else if (item.Action == "RESIZETHUMBNAIL")
{
//ResizeThumbnail(manager);
}
// just for kicks
Interlocked.Increment(ref RequestCount);
// every other request should throw exception, trigger ExecuteFailed
if (RequestCount % 2 == 0)
{
// Execption:
object obj = null;
obj.ToString();
}
// Complete request
manager.CompleteRequest(messageText: "Completed request " + DateTime.Now,
autoSave: true);
}
void Controller_ExecuteFailed(QueueMessageManager Message, Exception ex)
{
this.WriteEntry("Failed: " + Message.Item.Completed + "->" + Message.Item.Id + " - " + ex.Message);
}
private void controller_ExecuteFailed(QueueMessageManager manager, Exception ex)
{
Console.WriteLine("Failed (on purpose): " + manager.Item.QueueName + " - " + manager.Item.Id + " - " + ex.Message);
}
/// <summary>
/// Override this method to do any post processing that needs to happen
/// after each async operation has successfully completed. Optional - use
/// for things like logging or reporting on status.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
protected virtual void OnExecuteComplete(QueueMessageManager Message)
{
if (ExecuteComplete != null)
ExecuteComplete(Message);
}
protected override void OnExecuteFailed(QueueMessageManager manager, Exception ex)
{
var qm = manager.Item;
WriteMessage(qm);
base.OnExecuteFailed(manager, ex);
}
/// <summary>
/// Override this method to handle any errors that occured trying to receive
/// the next message from the SQL table.
///
/// Allows for error handling or logging in your own applications.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
/// <param name="ex">
/// Exeception that caused the operation to fail
/// </param>
protected virtual void OnNextMessageFailed(QueueMessageManager manager, Exception ex)
{
if (NextMessageFailed != null)
NextMessageFailed(manager, ex);
}
/// <summary>
/// Override this method to process your async operation. Required for
/// anything to happen when the message is processed. If the operation
/// succeeds (no exception), OnExecuteComplete will
/// be called. This method should throw an exception if the operation fails,
/// so that OnExecuteFailed will be fired.
/// </summary>
/// <param name="manager">
/// QueueManager instance. Use its Item property to get access to the current method
/// </param>
protected virtual void OnExecuteStart(QueueMessageManager manager)
{
if (ExecuteStart != null)
ExecuteStart(manager);
}
/// <summary>
/// This is the 'handler' code that actually does processing work
/// It merely calls into any events that are hooked up to the controller
/// for these events:
///
/// ExecuteStart
/// ExecuteComplete
/// ExecuteFailed
/// </summary>
/// <param name="manager">Instance of QueueMessageManager and it's Item property</param>
protected virtual void ExecuteSteps(QueueMessageManager manager)
{
try
{
// Hook up start processing
OnExecuteStart(manager);
// Hookup end processing
OnExecuteComplete(manager);
}
catch (Exception ex)
{
OnExecuteFailed(manager, ex);
}
MessagesProcessed++;
}
private void controller_ExecuteComplete(QueueMessageManager manager)
{
// grab the active queue item
var item = manager.Item;
// Log or otherwise complete request
Console.WriteLine(item.Id + " - " + item.QueueName + " - Item Completed");
}
/// <summary>
/// Message hook that's responsible for retrieving the next message.
/// The base version pulls the next message for the given queue.
/// You can override this method to conditionally override this
/// behavior such as filter when and how messages are read.
/// </summary>
/// <param name="manager">A manager instance that can retrieve</param>
/// <param name="queueName">The queue to check</param>
/// <returns></returns>
protected virtual QueueMessageItem OnGetNextQueueMessage(QueueMessageManager manager, string queueName)
{
return manager.GetNextQueueMessage(queueName);
}
protected override void OnExecuteComplete(QueueMessageManager manager)
{
base.OnExecuteComplete(manager);
LocalDataStoreSlot threadData = Thread.GetNamedDataSlot(STR_STARTTIME_KEY);
var watch = Thread.GetData(threadData);
int elapsed = 0;
if (watch != null)
{
((Stopwatch)watch).Stop();
elapsed = (int) ((Stopwatch)watch).ElapsedMilliseconds;
}
watch = null;
Thread.SetData(threadData, watch);
int waitingMessages = manager.GetWaitingQueueMessageCount(QueueName);
WriteMessage(manager.Item,elapsed,waitingMessages);
}
public QueueMessageManagerSerializationHelper(QueueMessageManager manager)
{
Manager = manager;
}